The article is wrong. That's my point and the writer does not understand how concrete is made. It's meant for people who do not understand what concrete is. The recipe for concrete was lost until the early 20th century so, like most modern technologies, we assume we know so much but we don't concrete was used thousands of years ago. Concrete also is a product that can be reclaimed.

And with the continued use of fiat that has can be produced infinitely there will be a shortage of food, water, sand, concrete... because the controllers of fiat can front run those who have to work for fiat.

I have an extensive and intimate knowledge of concrete. My grandfather, father, uncles and myself have all been working with concrete for many years. I've been an estimator, form carpenter, foreman and superintendent for many high rise projects, bridges and other civil and commercial ventures.